• Title, Summary, Keyword: instrumentation

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On the Manipulability measure of dual arm

  • Choi, Myoung-Hwan;Lee, Myoung-Yong;Lee, Bum-Hee;Ko, Myoung-Sam
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1156-1161
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    • 1990
  • The concept of the manipulability measure of the robotic mechanism is extended to the dual arm holding a single object. This is a measure of manipulating ability of the dual arm forming a closed kinematic chain in positioning and orienting the object. Dual arm manipulability measure is defined and compared to the single arm manipulability measure, and some properties are investigated.

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Instrumentation Failure after Partial Corpectomy with Instrumentation of a Metastatic Spine

  • Park, Sung Bae;Kim, Ki Jeong;Han, Sanghyun;Oh, Sohee;Kim, Chi Heon;Chung, Chun Kee
    • Journal of Korean Neurosurgical Society
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    • v.61 no.3
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    • pp.415-423
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    • 2018
  • Objective : To identify the perioperative factors associated with instrument failure in patients undergoing a partial corpectomy with instrumentation (PCI) for spinal metastasis. Methods : We assessed the one hundred twenty-four patients with who underwent PCI for a metastatic spine from 1987 to 2011. Outcome measure was the risk factor related to implantation failure. The preoperative factors analyzed were age, sex, ambulation, American Spinal Injury Association grade, bone mineral density, use of steroid, primary tumor site, number of vertebrae with metastasis, extra-bone metastasis, preoperative adjuvant chemotherapy, and preoperative spinal radiotherapy. The intraoperative factors were the number of fixed vertebrae, fixation in osteolytic vertebrae, bone grafting, and type of surgical approach. The postoperative factors included postoperative adjuvant chemotherapy and spinal radiotherapy. This study was supported by the National Research Foundation grant funded by government. There were no study-specific biases related to conflicts of interest. Results : There were 15 instrumentation failures (15/124, 12.1%). Preoperative ambulatory status and primary tumor site were not significantly related to the development of implant failure. There were no significant associations between insertion of a bone graft into the partial corpectomy site and instrumentation failure. The preoperative and operative factors analyzed were not significantly related to instrumentation failure. In univariable and multivariable analyses, postoperative spinal radiotherapy was the only significant variable related to instrumentation failure (p=0.049 and 0.050, respectively). Conclusion : When performing PCI in patients with spinal metastasis followed by postoperative spinal radiotherapy, the surgeon may consider the possibility of instrumentation failure and find other strategies for augmentation than the use of a bone graft for fusion.

Automated Diagnosis of Disease in Medical Information Management System (의료용 정보처리시스템에서 질환해석)

  • Kim, Hie-Sik;Choi, Gi-Sang;Kim, Gyu-Sik;Choi, Jin-Uk;Park, Jong-Sung;Lee, Pyong-Won;Kim, Eul-Sik;SeoMun, Jun
    • Proceedings of the KOSOMBE Conference
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    • v.1997 no.11
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    • pp.193-196
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    • 1997
  • This paper proposes a new medical information management system to be used or small to medium sized clinics and hospitals. The system is designed to process, analyze and manage each patient's clinical record using database technique. The structure of the database was determined and implemented through careful and rigorous study of medical practices in Korea and, therefore, reflects the needs of information management in Korean medical community. Furthermore, a sophisticated inference engine that can deduce possible disease from the result of medical examination is added to the system to provide doctors with a guideline in medical diagnoses.

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Age-dependent root canal instrumentation techniques: a comprehensive narrative review

  • Solomonov, Michael;Kim, Hyeon-Cheol;Hadad, Avi;Levy, Dan Henry;Itzhak, Joe Ben;Levinson, Oleg;Azizi, Hadas
    • Restorative Dentistry and Endodontics
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    • v.45 no.2
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    • pp.21.1-21.12
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    • 2020
  • The aim of this article was to review age-dependent clinical recommendations for appropriate root canal instrumentation techniques. A comprehensive narrative review of canal morphology, the structural characteristics of dentin, and endodontic outcomes at different ages was undertaken instead of a systematic review. An electronic literature search was carried out, including the Medline (Ovid), PubMed, and Web of Science databases. The searches used controlled vocabulary and free-text terms, as follows: 'age-related root canal treatment,' 'age-related instrumentation,' 'age-related chemo-mechanical preparation,' 'age-related endodontic clinical recommendations,' 'root canal instrumentation at different ages,' 'geriatric root canal treatment,' and 'pediatric root canal treatment.' Due to the lack of literature with practical age-based clinical recommendations for an appropriate root canal instrumentation technique, a narrative review was conducted to suggest a clinical algorithm for choosing the most appropriate instrumentation technique during root canal treatment. Based on the evidence found through the narrative review, an age-related clinical algorithm for choosing appropriate instrumentation during root canal treatment was proposed. Age affects the morphology of the root canal system and the structural characteristics of dentin. The clinician's awareness of root canal morphology and dentin characteristics can influence the choice of instruments for root canal treatment.

An Analysis of Instrumentation Radar's Beacon Tracking Performance Considering a Target Attitude (표적의 자세 변화를 고려한 계측 레이더의 비콘 추적 성능 분석)

  • Ryu, Chung-Ho;Ye, Sung-Hyuck;Hwang, Gyu-Hwan;Seo, Il-Hwan
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.4
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    • pp.561-568
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    • 2010
  • Instrumentation radar in a test range has an important role to measure target's TSPI(time, space, position, information). It is well known that it tracks a target stably using a beacon mode. But it may fail to track a target in a certain region using a beacon mode. In this paper, we modeled a simple missile shape similar to ATCMS with two beacon antenna and analyzed an antenna radiation pattern using MLFMM(Multi Level Fast Multipole Method) method. Using the analyzed result of the radiation pattern of the antenna and the attitude data of target, we simulated beacon tracking performance of an instrumentation radar. As a result of simulation, we showed that an instrumentation radar may lose the target because it tracks a area of the beacon antenna pattern.

Modern Probabilistic Machine Learning and Control Methods for Portfolio Optimization

  • Park, Jooyoung;Lim, Jungdong;Lee, Wonbu;Ji, Seunghyun;Sung, Keehoon;Park, Kyungwook
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.14 no.2
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    • pp.73-83
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    • 2014
  • Many recent theoretical developments in the field of machine learning and control have rapidly expanded its relevance to a wide variety of applications. In particular, a variety of portfolio optimization problems have recently been considered as a promising application domain for machine learning and control methods. In highly uncertain and stochastic environments, portfolio optimization can be formulated as optimal decision-making problems, and for these types of problems, approaches based on probabilistic machine learning and control methods are particularly pertinent. In this paper, we consider probabilistic machine learning and control based solutions to a couple of portfolio optimization problems. Simulation results show that these solutions work well when applied to real financial market data.

Thermal Characterization of Individual Pixels in Microbolometer Image Sensors by Thermoreflectance Microscopy

  • Ryu, Seon Young;Choi, Hae Young;Kim, Dong Uk;Kim, Geon Hee;Kim, Taehyun;Kim, Hee Yeoun;Chang, Ki Soo
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.15 no.5
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    • pp.533-538
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    • 2015
  • Thermal characterization of individual pixels in microbolometer infrared image sensors is needed for optimal design and improved performance. In this work, we used thermoreflectance microscopy on uncooled microbolometer image sensors to investigate the thermal characteristics of individual pixels. Two types of microbolometer image sensors with a shared-anchor structure were fabricated and thermally characterized at various biases and vacuum levels by measuring the temperature distribution on the surface of the microbolometers. The results show that thermoreflectance microscopy can be a useful thermal characterization tool for microbolometer image sensors.

Design and simulation of resonance based DC current sensor

  • Santhosh Kumar, B.V.M.P.;Suresh, K.;Varun Kumar, U.;Uma, G.;Umapathy, M.
    • Interaction and multiscale mechanics
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    • v.3 no.3
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    • pp.257-266
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    • 2010
  • A novel resonance based proximity DC current sensor is proposed. The sensor consists of a piezo sensed and actuated cantilever beam with a permanent magnet mounted at its free end. When the sensor is placed in proximity to a wire carrying DC current, resonant frequency of the beam changes with change in current. This change in resonant frequency is used to determine the current through the wire. The structure is simulated in micro and meso scale using COMSOL Multi physics software and the sensor is found to be linear with good sensitivity.